Create Measurement History View

[darinh]

Requirements

• View Title: {Transmitter Name / Id} : {Measurement Name}
• Display a line graph with points indicating the values collected.
• Y-Axis: Auto-scale @ +/- 5%
• X-Axis: Time or Measurement #

Optional

• Tapping a point on the graph displays it's X and Y values in a 'tooltip'
• Display the data in a table below the graph: [ # | Time | Value ]

[darinh]

I need to define the storage model before I can implement this.

• CommService retrieves data from the gateway about the transmitters and stores relevant data into a model.

Transmitter Model:

• id
• name?

Historical Data Option 1

• measurements<datetime, Measurement>

Historical Data Option 2

• pvMeasurements<datetime, float>
• svMeasurements<datetime, float>
• tvMeasurements<datetime, float>
• qvMeasurements<datetime, float>

Measurement Model for option 1

• pv (float)
• sv (float)
• tv (float)
• qv (float)

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Historical Data Option 1: Pros:

• If we need to know what all the measurements were for a single scan, it is easy to get to.
• The Transmitter Detail View displays all 4 measurements, so this could be convenient.
• If the scope was expanded to allow cycling through measurements on the Transmitter Dtail View, this would make things very simple.

Cons:

• If we only want to display the trend / history for a single measurement, we get extra data.

Historical Data Option 2: Pros:

• The data is stored exactly how it will be used on the Measurement History View
• There are no other identified use cases for the data, so this satisfies the project requirements

Cons:

• If the project scope were to be expanded, the storage model, CommService, and data would likely require modification to accommodate the change in requirements.